Re: female mayfly
The only time I've ever noticed a male/female mayfly preference in rising trout was a trico spinner fall--the trout were keyed on the females--they would rush a male imitation but turn away 1" short of the fly. Switch to a female imitation and they would continue through with the gulp. Switch back to a male imitation and the rising trout would go back to making a 1" inspection and then turn away.
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